Heating unit



Aug. 7, 1923.

H. w. MITCHELL HEATING UNIT Filed NOV. 12 1921 i 2 Sheets-Sheet 1 BEBE QNEN ESE] ESEEQ |NVENTOR BY; J /ZM I ATTORNEY Aug. 7, 1923. 1,463.903

' H. w. MITCHELL HEATING UNIT Filed Nov. 12 1921 2 Sheets-Sheet 2 IN YEN TOR Patented Aug. 7, 1923.

' UNITED, STAT HENRY W. MITCHELL, NEW YORK, NQY.

HEATING UNIT.

Application filed November 12, 1921. Serial No. 514,?23.

To all whom it may concern:

Be it known that I, HENRY W. Mn'cimm,

a citizen of the United States, and resident of city of New York, county of New York State of New York,.h ave invented certain new and useful Improvements in Heating Units, of which the following is the specification.

The device the subject of this invention is,

a heating unit of almost universal use and while in the drawings I have showna few uses to which the .device'may be put from the description and specification which follows it will be realized that the device may operate very efiiciently ways not herein referred to nor described.

' The object of the invention is' to provide a heating unit that may'be utilized directly or. in conjunction with other devices and a device wherein the heat generated may be under constant control so that whenthe device is utilized alone it will not be overheated and damaged, but when utilized with -.other bodies or devices, the heat may be increased so that other bodies or devices may in turn be heated to any desirable degree.

Another object of the invention is tolprovide means for preventing the destruction of the device through overheating under any and all conditions and still another object of the invention is to provide means for sup- .portin the device when in use. All of these jects and the means for accomplishing them will be fully set forth as the The accompanying drawings should be referred to for a complete understanding of the specification which follows.

used alone, showin one use only.

' Fig. 1 is a longitudinal m heating unit.

In the drawings sectional view of g. 2.is a'side elevation of the device as Fig. 3 is an. en

elevation of the device shown in Fig. 2.

Fig. eshows in. side elevation the use of my device for heating a sad iron. Fig. 5 is an end elevation thereof. Fig. 6 is a side elevation, partly in section showing y device in use as a heaterfor a grill or hot plate- ,Fig. 7 shows in elevation my device used as a'water heater.

Fig. 8 is a plan view of the thermostats. and support.

,mon, current carrying member or ring Fig. 9 is a side elevation thereof. I

Fig. 10 is a plan view of the switch plate showing the contact members.

Similar-reference numerals indicate like parts in all the figures Where they appear:

Referring to Fig. 1 it will be noted that my device is built up and supported upon a base member which maybe of cast iron or any other suitable metal and has formed member 19 of the'casing 18 and at the-upper Side of this casing and flange member I provide a recess the function of which will be later referred to.

A rotatable ring 21 is received in recesses 22 and 23 in the casing 18 and operates upon rotation a switch lever 24. The casing 18 may be in two parts having an extension or ring 25 which may be secured to the main body 18 by aily suitable means and screwthreaded into the ring 25 is a plug 26 receiving and retaining a second plug27 and I provide that a space 28 formed part1 .in each of the plugs 26 and 27 be arrange for the reception of a knot or clamp not shown which will secure the cable or electrical conductor not shown though which will enter through the perforation 29 in the plug 27.

.carryinga laminated contractor 33. This laminated member extends between a com- 34 to either of the blocks 35, 36 and 37 closing a circuit between these members.

Another member supported in the extension 18 is the plate 38 of insulating matrial carrying a plurality of thermostats shown'at 3.9, 40 and 41 and it will be noted that ablock 42 from one pole of each thermostat is in mechanical and electrical contact with one-of the switch blocks 35, 36 or 37. Each thermostat consists of a plate made'up of two diflerent metals in a well understood manner. A slight bowing action of the plate upon application of heat, will open the circuit through the block 41 and as this block is cut dia onally as shown and the thermostats shoulf each be constructed to open at different temperatures, the safe temperature of the section of the winding which they control.

Arranged upon the core member 15 are layers of insulating material 43, L4, 45 and 4:6 and between these layers of insulating material I arrange spirals or windings of resistance metal as shown at 47, 48 and 4 9. Each resistance spiral formsan independent element for a purpose, that shall appear laterand over the outer layer of insulation I place a shell 50 which may be of an suitable metal and which is provided with a recess 51 and a perforation 52, the perforation 52 communicating with the longitudinal passage 16 in the core member 15.

' I may provide clamps or bracket members as shown at 53 and 54 one of which is adapted to be received in each of the recesses 20 and 51. These clamp members are provided with key hole perforations as shown at 55 and a handle 56 having projecting pins 57 and 58 is arranged between the members 53 and 54 and when the whole is assembled as shown in Fig. 2 the heating element may be used as'a li ht sad iron. It will be noted that each 0 amping member is provided with extensions as shown at 59 and 60 and which extend above the handle member 56 and when my device is reversed and the extensions 59 and 60 allowed torest upon a suitable support my device becomes an eflicient stove for heating or for cooking.

As shown in Fig. 4 my heating element may be employed for heating a sad iron. For this service it is only necessary to provide an iron such as shown at 61 with a suitable recess into which the heating element may be introduced. In the iron shown I also provide means for retaining the heating element in the iron, this means consisting of a bl'ock 62 adapted to be retained by a knurled headed screw 63 in the recess 20 and I provide a supporting plate 64 for the screw 63 and guide 'pins 65 and 66 to prevent the block 62 rotating.

My device may also be employed with a hot plate as shown inFig. 6 where the late 67 is supported upon a dished mem- Ber 68 and my heater is inserted into the dished member the inner end of the heater being received upon a' bracket 69 and the outer end being retained by a block 70 and screw 71. The inner side of the dished member should be polished to reflect the heat upward and I may provide legs as shown at 72 and 73 for supporting the My device may also be used as a curling iron heater thecurling duced into the longitudlnal recess 16 in the core 15.

iron being intro- 1 My device may also be employed with a percolator, it only being necessary to arrange a perforated support for the coffee on about the water line shown in Fi 7 and a cover for the container "through wiiich my heater may be passed, the boiling water Wlll then pass u ward through the recess 16 and outward t rough the percolation; 17 and other uses for the. device may readily be discovered.

Having carefully and fully described my invention what I claim and desire to obtain is as follows:

1. In a heating element a core member, electrical resistance conductors supported by said core member and a casing for said conductors, said casing and said coremember each being provided with recesses and a supporting means adapted to be engaged in said recesses.

2. A heating unit having a casing provided withrecesses, supporting members received in said recesses and a handle member retainingsaid supporting members in operable position.

3. A heating unit having a casing provided with recesses, supporting members received in said recesses each said supporting member bein provided with a key-hole slot and a han e member having stud pins adapted to engage in said slots for retaining said supporting members in operable position, projections u 11 said supporting means and extending yond the, grip of the handle and adapted to support said heating unit in a reversed position.

4. A heatin unit having a core member, electrical con uctors supported thereby, said core member being provided with longitudinal and transverse perforations away from 

